Could you please open up a JIRA issue for this with a link to this
discussion? I think it is something Igor might have an idea about (but
he's no a vacation now).
Eelco
On 6/3/07, Rüdiger Schulz <[EMAIL PROTECTED]> wrote:
> I put a breakpoint in the constructor of my Form, which has the
> @SpringBean annotation on ia property named logic.
>
> Before the super() call, logic is null.
>
> After that, it is set to $Proxy39, with a h-attribute to a
> org.apache.wicket.proxy.LazyInitProxyFactory$JdkHandler. The target
> property of the handler is null.
>
> After the next line, where I call a method from logic, the target
> property is set to the bean instance.
>
> So it seems that the reference gets lost in the first call.
>
>
> But, as you said that the bean is transient anyway, I think that
> prototype beans could not be used that way for holding state of wicket
> components, because that state should certainly also be kept when
> using the back button.
>
> I'm not sure what is best then. I could get a reference to the spring
> bean directly from ApplicationContext, and just keep it. But then I
> would face the problem of serialization.
>
> The best thing would be IMHO if the proxy could somehow do an
> automatic re-lookup from Spring for prototype beans, so that not a new
> instance is fetched from the container, but the same as before. But I
> don't know enough about Spring to say if that is even possible.
>
>
>
> 2007/6/3, Eelco Hillenius <[EMAIL PROTECTED]>:
> > I'm not that familiar with the code, but the interesting thing is that
> > LazyInitProxyFactory$JdkHandler does cache the bean it located:
> >
> > if (target == null)
> > {
> > target = locator.locateProxyTarget();
> > }
> > return proxy.invoke(target, args);
> >
> > The target is a transient member of JdkHandler and judging from the
> > code, once the bean is located it should just be reused until the page
> > is serialized/ deserialized (for backbutton support or when
> > clustered).
> >
> > Can you use you debugger to find out what exactly happens?
> >
> > Eelco
> >
> > On 6/1/07, Rüdiger Schulz <[EMAIL PROTECTED]> wrote:
> > > Right, forgot the Stacktraces:
> > >
> > > The first when calling super():
> > > at KitManagementBean.<init>(KitManagementBean.java:34)
> > > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > > Method)
> > > at
> > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> > > at
> > > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> > > at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> > > at
> > > org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:85)
> > > at
> > > org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)
> > > at
> > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:732)
> > > at
> > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:720)
> > > at
> > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:386)
> > > at
> > > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:270)
> > > at
> > > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
> > > at
> > > org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:707)
> > > at
> > > org.apache.wicket.spring.SpringBeanLocator.lookupSpringBean(SpringBeanLocator.java:240)
> > > at
> > > org.apache.wicket.spring.SpringBeanLocator.locateProxyTarget(SpringBeanLocator.java:163)
> > > at
> > > org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.testLocator(AnnotProxyFieldValueFactory.java:124)
> > > at
> > > org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.getFieldValue(AnnotProxyFieldValueFactory.java:99)
> > > at org.apache.wicket.injection.Injector.inject(Injector.java:109)
> > > at
> > > org.apache.wicket.injection.ConfigurableInjector.inject(ConfigurableInjector.java:40)
> > > at
> > > org.apache.wicket.injection.ComponentInjector.onInstantiation(ComponentInjector.java:54)
> > > at
> > > org.apache.wicket.Application.notifyComponentInstantiationListeners(Application.java:916)
> > > at org.apache.wicket.Component.<init>(Component.java:708)
> > > at
> > > org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:111)
> > > at
> > > org.apache.wicket.markup.html.WebMarkupContainer.<init>(WebMarkupContainer.java:39)
> > > at org.apache.wicket.markup.html.form.Form.<init>(Form.java:233)
> > > at KitForm.<init>(KitForm.java:50)
> > > at KitEditPage.<init>(KitEditPage.java:45)
> > >
> > > And from the next line, where I call a method on the bean:
> > >
> > > at KitManagementBean.<init>(KitManagementBean.java:34)
> > > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > > Method)
> > > at
> > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> > > at
> > > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> > > at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> > > at
> > > org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:85)
> > > at
> > > org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)
> > > at
> > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:732)
> > > at
> > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:720)
> > > at
> > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:386)
> > > at
> > > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:270)
> > > at
> > > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
> > > at
> > > org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:707)
> > > at
> > > org.apache.wicket.spring.SpringBeanLocator.lookupSpringBean(SpringBeanLocator.java:240)
> > > at
> > > org.apache.wicket.spring.SpringBeanLocator.locateProxyTarget(SpringBeanLocator.java:163)
> > > at
> > > org.apache.wicket.proxy.LazyInitProxyFactory$JdkHandler.invoke(LazyInitProxyFactory.java:389)
> > > at org.apache.wicket.proxy.$Proxy39.init(Unknown Source)
> > > at KitForm.<init>(KitForm.java:51)
> > > at KitEditPage.<init>(KitEditPage.java:45)
> > >
> > >
> > > 2007/6/1, Rüdiger Schulz <[EMAIL PROTECTED]>:
> > > > Hello everybody,
> > > >
> > > > I already tried to chat on ##wicket about this, but it's probably too
> > > > complex for IRC...
> > > >
> > > > I'm using Wicket 1.3.0 snapshot and Spring 2.0 on JDK6 / Jetty. For a
> > > > more complex form I wanted to use a "stateful" Springbean, to which I
> > > > applied scope="prototype". The idea is to have one bean instance for
> > > > every Form instance. I would access the bean with PropertyModels and
> > > > direct method calls during construction (i.e. setting initial state
> > > > from input parameters) and during events, which would alter the state.
> > > > I inject the bean into the Form with @SpringBean annotation.
> > > >
> > > > This works somehow, but sometimes, especially after using the
> > > > backbutton, I had the problem that the internal state was reset. So I
> > > > analyzed the stack in the constructor of the bean implementation, and
> > > > found out that it was called twice during construction of the Form.
> > > > First, during the super() call, and then again in the next line during
> > > > a method call on that bean. I appended both stacktraces below. The
> > > > proxy itself does not change.
> > > >
> > > > This happens again after going back and e.g. submitting again. This
> > > > results in a NPE, because the internal state is reset.
> > > >
> > > > I understand from reading the mailing list that the Wicket-Proxy does
> > > > nothing but a lookup in the Application context, and does not know or
> > > > care about spring scope.
> > > >
> > > > And here I'm a little stuck. I am already considering to put the state
> > > > into the Form, and make the Bean a singleton without any internal
> > > > state. As that would mean some heavy refactoring, I would prefer a way
> > > > where the Spring acces would work as I want. Or is this a wrong way
> > > > altogether?
> > > >
> > > > thanks in advance for any comments.
> > > >
> > > > --
> > > > greetings from Berlin,
> > > >
> > > > Rüdiger Schulz
> > > >
> > > > www.2rue.de
> > > >
> > >
> > >
> > > --
> > > greetings from Berlin,
> > >
> > > Rüdiger Schulz
> > >
> > > www.2rue.de
> > >
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>
> --
> greetings from Berlin,
>
> Rüdiger Schulz
>
> www.2rue.de
>
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